901  * Locks the extent and properly waits for data=ordered extents to finish
924 		struct btrfs_ordered_extent *ordered;  in lock_and_cleanup_extent_if_need()  local
937 		ordered = btrfs_lookup_ordered_range(inode, start_pos,  in lock_and_cleanup_extent_if_need()
939 		if (ordered &&  in lock_and_cleanup_extent_if_need()
940 		    ordered->file_offset + ordered->num_bytes > start_pos &&  in lock_and_cleanup_extent_if_need()
941 		    ordered->file_offset <= last_pos) {  in lock_and_cleanup_extent_if_need()
946 			btrfs_start_ordered_extent(ordered);  in lock_and_cleanup_extent_if_need()
947 			btrfs_put_ordered_extent(ordered);  in lock_and_cleanup_extent_if_need()
950 		if (ordered)  in lock_and_cleanup_extent_if_need()
951 			btrfs_put_ordered_extent(ordered);  in lock_and_cleanup_extent_if_need()
974  * This function will flush ordered extents in the range to ensure proper
1456 	 * update the last_trans of the inode during ordered extent completion,  in skip_inode_logging()
1472  * It needs to call filemap_fdatawait so that all ordered extent updates are
1506 	 * races between hole detection during logging and completion of ordered  in btrfs_sync_file()
1507 	 * extents outside the range, to missing checksums due to ordered extents  in btrfs_sync_file()
1547 	 * wait for all ordered extents to complete below.  in btrfs_sync_file()
1572 	 * For a full fsync we wait for the ordered extents to complete while  in btrfs_sync_file()
1574 	 * attach the ordered extents to the transaction so that a transaction  in btrfs_sync_file()
1576 	 * the current transaction commits before the ordered extents complete  in btrfs_sync_file()
1580 	 * logical address recorded in the ordered extent may change. We need  in btrfs_sync_file()
1588 		 * Get our ordered extents as soon as possible to avoid doing  in btrfs_sync_file()
1590 		 * checksums attached to the ordered extents.  in btrfs_sync_file()
1602 		 * case an error happened and we need to wait for ordered  in btrfs_sync_file()
1623 		 * An ordered extent might have started before and completed  in btrfs_sync_file()
1703 	 * the ordered extents, start it again and commit the transaction.  If  in btrfs_sync_file()
1704 	 * we attempt to wait on the ordered extents here we could deadlock with  in btrfs_sync_file()
1720 		 * making sure the transaction that had the ordered extents is  in btrfs_sync_file()
1780 	struct btrfs_ordered_extent *ordered;  in btrfs_page_mkwrite()  local
1847 	 * We can't set the delalloc bits if there are pending ordered  in btrfs_page_mkwrite()
1850 	ordered = btrfs_lookup_ordered_range(BTRFS_I(inode), page_start, fsize);  in btrfs_page_mkwrite()
1851 	if (ordered) {  in btrfs_page_mkwrite()
1855 		btrfs_start_ordered_extent(ordered);  in btrfs_page_mkwrite()
1856 		btrfs_put_ordered_extent(ordered);  in btrfs_page_mkwrite()
2122 		 * We can't have ordered extents in the range, nor dirty/writeback  in btrfs_punch_hole_lock_range()
2126 		 * for any ordered extents in the range to complete.  in btrfs_punch_hole_lock_range()
3009 	 * all ordered extents in the range to complete. After this we can lock  in btrfs_fallocate()
3011 	 * can't be more delalloc or ordered extents in the range.  in btrfs_fallocate()
3169 			/* Else trim our search range for ordered extents. */  in find_delalloc_subrange()
3179 	 * Now also check if there's any ordered extent in the range.  in find_delalloc_subrange()
3184 	 *    an ordered extent for the write. So we might just have been called  in find_delalloc_subrange()
3185 	 *    after delalloc is flushed and before the ordered extent completes  in find_delalloc_subrange()
3188 	 * 2) We may have an ordered extent created by flushing delalloc for a  in find_delalloc_subrange()
3193 	 * being flushed, but using the ordered extents tree is more efficient  in find_delalloc_subrange()
3194 	 * because it's usually much smaller as ordered extents are removed from  in find_delalloc_subrange()
3203 	/* The ordered extent may span beyond our search range. */  in find_delalloc_subrange()
3209 	/* Don't have unflushed delalloc, return the ordered extent range. */  in find_delalloc_subrange()
3217 	 * We have both unflushed delalloc (io_tree) and an ordered extent.  in find_delalloc_subrange()
3701 	 * from there.  We have to do this otherwise we'll miss the ordered  in btrfs_fdatawrite_range()